I just changed the clutch in my 2001 Jeep Wrangler not because it was bad, but because the throw out bearing disintegrated. After the grueling process, got it all back together and the transfer case won't shift out out 4 low. Is it because a small amount of case fluid leaked out during the operation, was I not supposed to turn front or back drive shafts (someone said I was supposed to mark them) or could it be something else???